Am I pregnant ?!

My period is late by 2 days. I had sex on my first day of my period and has very very light spotting so I put a tampon  in thinking it was the start of my period. Well I was wrong. Then second day very very light spotting when I wiped from using the bath room and haven't had any spotting since then. I've been going to the rest room 2-3 times a night and too many times to count during the day. Could I be pregnant ?